Abstract
Debris-flow braker screen dam is the facility against debris flow, it segregates sediments and water from running down debris flow, so that have been reduced its running speed, then stopped and desposited boulders and much soil.
This Debris-flow braker's screens are the trapezoidal steel pipes that are new development products considered these function and maintenance.
This experimental study is the examination strength characteristics of this trapezoidal steel pipe from static and dynamic loading tests.
So we make the proposal relation formula between the pipe's deformation and the impact energy of the boulder in debris flow from the results of these tests.
This relation formula applies to the deformation gages of the setting up Debris-flow braker's screens at Noziri-river in Sakurajima, so it's estimated that impact energy is about 8. 71t·m, and impact pressure is about 40tons for changing to the static load.
